The puzzle pieces in his head rearrange themselves and interlock into one and other to revel the bigger picture. She knew… she knew that he slept with Santana. She wouldn’t be asking if she didn’t because they had already had this conversation. It should have been over with but if she was bringing it up again, and she was this mad-- then she definitely knew.
His face was blank, eyes slightly wider than before as a million thoughts ran through his head. Wondering how she found out, who told her, what he was going to say, how to fix things. After what felt like forever, he answered. “Rach, look…” Finn trailed off for a moment before sighing and finishing. “Yeah. I slept with Santana.”